#!/bin/bash
function name() {
    local sum
    sum=$(($1 + $2))
    echo $sum
}
function selectnum() {
    case "$1" in
    1)
        echo "item = 1"
        ;;
    2 | 3)
        echo "item = 2 or item = 3"
        ;;
    *)
        echo "default (none of above)"
        ;;
    esac

}
while true; do
    echo '123'
done

# name 1 2
selectnum 2
